MOD11A1 v006

MODIS/Terra Land Surface Temperature/Emissivity Daily L3 Global 1 km SIN Grid


PI: Zhengming Wan

Description

The MOD11A1 Version 6 product provides daily per-pixel Land Surface Temperature and Emissivity (LST&E) with 1 kilometer (km) spatial resolution in a 1,200 by 1,200 km grid. The pixel temperature value is derived from the MOD11_L2 swath product. Above 30 degrees latitude, some pixels may have multiple observations where the criteria for clear-sky are met. When this occurs, the pixel value is a result of the average of all qualifying observations. Provided along with the daytime and nighttime surface temperature bands are associated quality control assessments, observation times, view zenith angles, and clear-sky coverages along with bands 31 and 32 emissivities from land cover types.

Characteristics

Improvements/Changes from Previous Versions

  • Removed cloud-contaminated LSTs from Level 2 and Level 3 LST products.
  • Updated the coefficient look-up table (LUT) for the split-window algorithm with comprehensive regression analysis of Moderate Resolution Imaging Spectroradiometer (MODIS) simulation data in bands 31 and 32 over wide ranges of surface and atmospheric conditions, especially extending the upper boundary for (LST – Ts-air) in arid and semi-arid regions. Increased the overlap between various sub-ranges to reduce the sensitivity of the algorithm to uncertainties in the input data (i.e., column water vapor and air surface temperature from MOD07).
  • Made minor adjustments in the classification-based surface emissivity values, especially for bare soil and rocks land cover types.
  • Tuned the day/night algorithm by adjusting weights to improve performance in desert regions where the incorporated split-window algorithm may not work well.
  • Generated new gridded LST&E products with a 6 km spatial resolution for 8-day (MOD11B2) and monthly (MOD11B3) intervals in response to user community requests.

Product Maturity

Validation at stage 2 has been achieved for all MOD11 LST&E products. Further details regarding MODIS land product validation for MOD11A1 data products is available from the MODIS land team validation site.

Collection and Granule

Collection

Characteristic Description
CollectionTerra MODIS
DOI10.5067/MODIS/MOD11A1.006
File Size~2 MB
Temporal ResolutionDaily
Temporal Extent2000-02-24 to Present
Spatial ExtentGlobal
Coordinate SystemSinusoidal
DatumN/A
File FormatHDF-EOS
Geographic Dimensions1200 km x 1200 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers12
Columns/Rows1200 x 1200
Pixel Size1000 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor Additional Offset
LST_Day_1km Daytime Land Surface Temperature Kelvin 16-bit unsigned integer 0 N/A 7500 to 65535 0.02 N/A
QC_Day Daytime LST Quality Indicators Bit Field 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
Day_view_time Local time of day observation Hours 8-bit unsigned integer 255 N/A 0 to 240 0.1 N/A
Day_view_angl View zenith angle of day observation Degree 8-bit unsigned integer 255 N/A 0 to 130 N/A -65
LST_Night_1km Nighttime Land Surface Temperature Kelvin 16-bit unsigned integer 0 N/A 7500 to 65535 0.02 N/A
QC_Night Nighttime LST Quality indicators Bit Field 8-bit unsigned integer N/A N/A 0 to 255 N/A N/A
Night_view_time Local time of night observation Hours 8-bit unsigned integer 255 N/A 0 to 240 0.1 N/A
Night_view_angl View zenith angle of night observation Degree 8-bit unsigned integer 255 N/A 0 to 130 N/A -65
Emis_31 Band 31 emissivity N/A 8-bit unsigned integer 0 N/A 1 to 255 0.002 0.49
Emis_32 Band 32 emissivity N/A 8-bit unsigned integer 0 N/A 1 to 255 0.002 0.49
Clear_day_cov Day clear-sky coverage N/A 16-bit unsigned integer 0 N/A 1 to 65535 0.0005 N/A
Clear_night_cov Night clear-sky coverage N/A 16-bit unsigned integer 0 N/A 1 to 65535 0.0005 N/A

Product Quality

The Quality Control (QC) layers are stored in an efficient bit-encoded manner. The unpack_sds_bits executable from the LDOPE Tools is available to the user community to help parse and interpret the QC layers.

In addition to data access and transformation processes, AppEEARS also has the capability to unpack and interpret the quality layers.

The QA bit flags for the QC layers are provided in the User Guide in Table 13 on page 21.

Please note that whenever the Mandatory QA flags (bits 0-1) have a value of 2 (decoded to 10) or 3 (decoded to 11), LST is not produced due to cloud effects or other reasons. Under these conditions, all remaining QA bits and SDS layers are undefined (although bit flags display as 00).

Known Issues

For complete information about the MOD11A1 known issues please refer to the MODIS Land Quality Assessment website.

Documentation

Using the Data

E-Learning

Discover NASA Land Processes Data with Web Services

Getting Started with MODIS Version 6 Land Surface Temperature Data Part 2: Using the Data

Getting Started with MODIS Version 6 Land Surface Temperature Data Part 3: Interpreting Quality Information

Using NASA's AppEEARS to Slice and Dice Big Earth Data

Data In Action

Highlights from the Literature: January to March 2017

Exploring Snow and Land Surface Temperature Data in AppEEARS

Highlights from the Literature: January to March 2015

Highlights from the NASA DEVELOP National Program Spring 2018 Term

Highlights from the NASA DEVELOP National Program Spring 2016 Term

Sensing Our Planet: NASA Earth Science Research Features 2014

Highlights from the Literature: April to June 2019

Tools

Citation

DOI: 10.5067/MODIS/MOD11A1.006

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